Buggy code:
private static final String RESPONSE_PARSERS = JMeterUtils . getProperty ( "HTTPResponse.parsers" ) ; private boolean dynamicPath = false ; public HTTPSamplerBase ( ) { } public boolean getSendFileAsPostBody ( ) { } public boolean getSendParameterValuesAsPostBody ( ) { } public boolean getUseMultipartForPost ( ) { } public void setProtocol ( String value ) { } public String getProtocol ( ) { } public String getClient ( ) { } public void setClient ( String client ) { } public void setPath ( String path ) { } public void setPath ( String path , String contentEncoding ) { } public String getPath ( ) { } public void setFollowRedirects ( boolean value ) { } public boolean getFollowRedirects ( ) { } public void setAutoRedirects ( boolean value ) { } public boolean getAutoRedirects ( ) { } public void setMethod ( String value ) { } public String getMethod ( ) { } public void setContentEncoding ( String value ) { } public String getContentEncoding ( ) { } public void setUseKeepAlive ( boolean value ) { } public boolean getUseKeepAlive ( ) { } public void setDoMultipartPost ( boolean value ) { } public boolean getDoMultipartPost ( ) { } public void setMonitor ( String value ) { } public void setMonitor ( boolean truth ) { } public String getMonitor ( ) { } public boolean isMonitor ( ) { } public void setImplementation ( String value ) { } public String getImplementation ( ) { } public boolean useMD5 ( ) { } public void setMD5 ( boolean truth ) { } public void addEncodedArgument ( String name , String value ) { } public void addEncodedArgument ( String name , String value , String metaData , String contentEncoding ) { } public void addEncodedArgument ( String name , String value , String metaData ) { } public void addNonEncodedArgument ( String name , String value , String metadata ) { } public void addArgument ( String name , String value ) { } public void addArgument ( String name , String value , String metadata ) { } public boolean hasArguments ( ) { } @ Override public void addTestElement ( TestElement el ) { } public void setPort ( int value ) { } public static int getDefaultPort ( String protocol , int port ) { } public int getPortIfSpecified ( ) { } public boolean isProtocolDefaultPort ( ) { } public int getPort ( ) { } public void setDomain ( String value ) { } public String getDomain ( ) { } public void setConnectTimeout ( String value ) { } public int getConnectTimeout ( ) { } public void setResponseTimeout ( String value ) { } public int getResponseTimeout ( ) { } public String getProxyHost ( ) { } public int getProxyPortInt ( ) { } public String getProxyUser ( ) { } public String getProxyPass ( ) { } public void setArguments ( Arguments value ) { } public Arguments getArguments ( ) { } public void setAuthManager ( AuthManager value ) { } public AuthManager getAuthManager ( ) { } public void setHeaderManager ( HeaderManager value ) { } public HeaderManager getHeaderManager ( ) { } public void setCookieManager ( CookieManager value ) { } public CookieManager getCookieManager ( ) { } public void setCacheManager ( CacheManager value ) { } public CacheManager getCacheManager ( ) { } public boolean isImageParser ( ) { } public void setImageParser ( boolean parseImages ) { } public String getEmbeddedUrlRE ( ) { } public void setEmbeddedUrlRE ( String regex ) { } protected HTTPSampleResult errorResult ( Throwable e , HTTPSampleResult res ) { <START_BUG> res . setSampleLabel ( "Error" ) ; <END_BUG> res . setDataType ( TEXT ) ; ByteArrayOutputStream text = new ByteArrayOutputStream ( 200 ) ; e . printStackTrace ( new PrintStream ( text ) ) ; res . setResponseData ( text . toByteArray ( ) ) ; res . setResponseCode ( ( ( ( HTTPSamplerBase . NON_HTTP_RESPONSE_CODE ) + ":<seq2seq4repair_space>" ) + ( e . getClass ( ) . getName ( ) ) ) ) ; res . setResponseMessage ( ( ( ( HTTPSamplerBase . NON_HTTP_RESPONSE_MESSAGE ) + ":<seq2seq4repair_space>" ) + ( e . getMessage ( ) ) ) ) ; res . setSuccessful ( false ) ; res . setMonitor ( this . isMonitor ( ) ) ; return res ; } private static final String HTTP_PREFIX = ( PROTOCOL_HTTP ) + ":////" ; private static final String HTTPS_PREFIX = ( PROTOCOL_HTTPS ) + ":////" ; public java . net . URL getUrl ( ) throws MalformedURLException { } public String getQueryString ( ) { } public String getQueryString ( String contentEncoding ) { } public void parseArguments ( String queryString , String contentEncoding ) { } public void parseArguments ( String queryString ) { } @ Override public String toString ( ) { } public SampleResult sample ( Entry e ) { } public SampleResult sample ( ) { } private HTTPSampleResult fileSample ( URI uri ) throws IOException { } protected abstract HTTPSampleResult sample ( java . net . URL u , String method , boolean areFollowingRedirect , int depth ) { } protected HTTPSampleResult downloadPageResources ( HTTPSampleResult res , HTTPSampleResult container , int frameDepth ) { } private String getParserClass ( HTTPSampleResult res ) { } protected String encodeSpaces ( String path ) { } public void testEnded ( ) { } public void testEnded ( String host ) { } public void testIterationStart ( LoopIterationEvent event ) { } public void testStarted ( ) { } public void testStarted ( String host ) { } @ Override public Object clone ( ) { } protected HTTPSampleResult followRedirects ( HTTPSampleResult res , int frameDepth ) { } protected HTTPSampleResult resultProcessing ( boolean areFollowingRedirect , int frameDepth , HTTPSampleResult res ) { } protected boolean isSuccessCode ( int code ) { } protected static String encodeBackSlashes ( String value ) { }

Fix:
res . setSampleLabel ( ( "Error:<seq2seq4repair_space>" + ( res . getSampleLabel ( ) ) ) ) ;